Methods, devices and systems of supporting discontinuous operation in communication systems using vectoring Methods, devices and techniques are disclosed where vectoring is adapted to lines becoming inactive and active, for example in a discontinued operation. In some embodiments, the vectoring is modified based on already present coefficients.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method, comprising: transmitting signals over a plurality of lines in a discontinuous operation mode in a time division duplex (TDD) operation, wherein, on any of the plurality of lines, symbols are transmitted only when user data is available for transmission during a transmission opportunity of a TDD frame, and wherein any one of the plurality of lines is powered off when no data is available for transmission on that one of the plurality of lines during the transmission opportunity of the TDD frame, reducing crosstalk of the plurality of lines in a vectored group by vectoring, wherein an effective number of lines in the vectored group changes when any of the plurality of lines are powered off in the discontinuous operation mode, thereby resulting in a change of composition of the vectored group, and modifying the crosstalk reduction based on previous crosstalk reduction in case of the change of composition of the vectored group in the discontinuous operation mode.
2. The method of claim 1 , wherein reducing the crosstalk comprises at least one of a crosstalk precompensation prior to transmitting via the lines of the vectored group or a crosstalk equalization after receiving signals from the lines of the vectored group.
3. The method of claim 1 , wherein modifying the crosstalk reduction comprises performing the crosstalk reduction in a case, where only a subset of lines from a set of lines are active based on crosstalk reduction coefficients for a case where all lines of the set of lines are active.
4. The method of claim 3 , wherein the crosstalk reduction coefficients comprise at least one of precoder coefficients and equalization coefficients.
9. The method of claim 1 , further comprising performing a power allocation update.
10. The method of claim 9 , wherein the update is performed based on a scale factor.
11. A device, comprising: a plurality of transceivers configured to transmit signals over a plurality of lines in a discontinuous operation mode in a time division duplex (TDD) operation, wherein, on any of the plurality of lines, symbols are transmitted only when user data is available for transmission during a transmission opportunity of a TDD frame, and wherein any one of the plurality of lines is powered off when no data is available for transmission on that one of the plurality of lines, and a crosstalk reduction circuit operably coupled to the plurality of transceivers, and adapted to reduce crosstalk of a plurality of lines associated with the plurality of transceivers in a vectored group by vectoring, wherein an effective number of lines in the vectored group changes when any of the plurality of lines are powered off in the discontinuous operation mode, thereby resulting in a change of composition of the vectored group, and to modify the crosstalk reduction based on previous crosstalk reduction in case of the change of composition of the vectored group in the discontinuous operation mode.
12. The device of claim 11 , wherein the crosstalk reduction circuit comprises at least one of a crosstalk precompensator to precompensate crosstalk prior to transmitting signals via the lines of the vectored group or a crosstalk equalizer to cancel crosstalk after receiving signals from the lines of the vectored group.
13. The device of claim 11 , wherein for modifying the crosstalk reduction, the crosstalk reduction circuit is adapted to perform the crosstalk reduction in a case, where only a subset of lines from a set of lines are active based on crosstalk reduction coefficients for a case where all lines of the set of lines are active.
14. The device of claim 13 , wherein the crosstalk reduction coefficients comprise at least one of precoder coefficients and equalization coefficients.
19. The device of claim 13 , wherein the device is comprised in a distribution point.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
May 13, 2014
December 5, 2017
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